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This probabilistic forecast is issued by the North Central River Forecast Center.
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About this graph
Forecasts for the Fox River at Algonquin tailwater are issued as needed during times of high water, but are not routinely available.
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Zoom Level:15
Flood Categories (in feet)
Major Flood Stage: 12
Moderate Flood Stage: 10.5
Flood Stage: 9.5
Action Stage: 9
Low Stage (in feet): 4

Historic Crests
(1) 13.18 ft on 07/23/2017
(2) 12.70 ft on 04/23/2013
(3) 11.85 ft on 06/26/2018
(4) 11.83 ft on 05/23/2020
(5) 11.38 ft on 09/17/2019
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.83 ft on 05/23/2020
(2) 10.55 ft on 05/03/2020
(3) 9.54 ft on 10/31/2019
(4) 10.78 ft on 10/11/2019
(5) 11.38 ft on 09/17/2019
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 3.53 ft on 10/11/2012
(2) 4.18 ft on 03/02/2020
(3) 4.22 ft on 08/07/2015
(4) 4.29 ft on 08/11/2016
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
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18 Inundation of the floodplain reaches more than 1 block from the river in Algonquin.
17.5 Main Street is threatened in Algonquin.
16.5 IL-176 is threatened near Holiday Hills.
16 Numerous structures are threatened along Main Street in Algonquin. North Water Reclamation Facility property in Elgin is threatened.
15.5 Algonquin Road (IL-62) is threatened west of the river in Algonquin.
15 Inundation reaches up to 2 blocks from the river in Willow Lake Estates in Elgin. Railroad tracks are threatened in downtown Elgin.
14 Residences threatened along Riverview Drive and Holiday Drive in Holiday Hills. Residences threatened along Riverside Drive West south of McHenry. Structures are threatened along N Harrison Street in Algonquin. Algonquin Wastewater Treatment Facility property threatened.
13.5 Backwater causes Crystal Creek to threaten structures near the village hall in Algonquin.
13 Backwater causes Crystal Creek to threaten low-lying sections of Towne Park in Algonquin. Structures along Riverside Drive and Grove Ave are threatened in Elgin.
12.5 Prairie Trail is threatened at the river in Algonquin.
12 North Harrison Street is threatened near Riverside Park in Algonquin. Low-lying areas of Festival Park are threatened in Elgin.
11.5 Residences threatened along Oceola Drive in Algonquin. Jayne Street and Beach Drive threatened in Algonquin.
11 Filip Street and Fox River Drive threatened in Algonquin.
10.5 Low-lying sections of Cornish Park are inundated in Algonquin.
10 Winaki Trail and Onaway Trail are threatened south of Algonquin.
9.5 Boathouses threatened along the river in Cary.
9 Water overflows low-lying river banks along Grove Street in Valley View, along River Shore Drive in Cary, and along Riverview Drive and Holiday Drive in Holiday Hills.
Low Water Impacts Collapse
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3.5 River nears zero flow.
4.0 Approximate stage of the 1-in-10 annual chance flow (7-day average).
4.5 Low water levels begin to impact operations at Stratton and Algonquin Dams.

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
How much forecast precipitation was used for the current river forecast?
How low could the river get?
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
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Romeoville, IL 60446
(815) 834-1435
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Page last modified: 2-Nov-2020 7:29 PM
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